Dave,

Take a look at this kernel as it is the one I think we are going to
release (or a slightly newer 4.9.2x from kernel.org LTS). This version
has some newer settings that are more redhat/fedora/centos base kernel
like WRT what is a module and what is built into the kernel, etc.

https://people.centos.org/hughesjr/4.9.x/

Thanks,
Johnny Hughes

On 04/14/2017 05:16 AM, Anderson, Dave wrote:
> List moderator: feel free to delete my previous large message with attachments that's in the moderation queue...it's now obsolete anyway.
>
>
> I have found a fix/workaround for my reboot issues with Xen 4.6.3-12 + Kernel 4.9.13:
>
> Once I finally got serial output all the way through the boot process (xen+dom0) I discovered the stack trace:
>
> [Firmware Bug]: CPU7: APIC id mismatch. Firmware: 0 APIC: 7
> installing Xen timer for CPU 8
> [Firmware Bug]: CPU8: APIC id mismatch. Firmware: 0 APIC: 20
> smpboot: Package 1 of CPU 8 exceeds BIOS package data 1.
> ------------[ cut here ]------------
> kernel BUG at arch/x86/kernel/cpu/common.c:997!
> invalid opcode: 0000 [#1] SMP
> Modules linked in:
> CPU: 8 PID: 0 Comm: swapper/8 Not tainted 4.9.13-22.el7.x86_64 #1
> Hardware name: Supermicro X9DRT/X9DRT, BIOS 3.2a 08/04/2015
> random: fast init done
> task: ffff880058a8c4c0 task.stack: ffffc900400b4000
> RIP: e030:[<ffffffff8103e527>]  [<ffffffff8103e527>] identify_secondary_cpu+0x57/0x80
> RSP: e02b:ffffc900400b7f08  EFLAGS: 00010086
> RAX: 00000000ffffffe4 RBX: ffff88005d80a020 RCX: ffffffff81c5be68
> RDX: 0000000000000001 RSI: 0000000000000005 RDI: 0000000000000005
> RBP: ffffc900400b7f18 R08: 00000000000000cb R09: 0000000000000004
> R10: 0000000000000000 R11: 0000000000000006 R12: 0000000000000008
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> FS:  0000000000000000(0000) GS:ffff88005d800000(0000) knlGS:0000000000000000
> CS:  e033 DS: 002b ES: 002b CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 0000000001c07000 CR4: 0000000000042660
> Stack:
>  0000000000000008 0000000000000000 ffffc900400b7f28 ffffffff8104e94e
>  ffffc900400b7f40 ffffffff81029925 0000000000000000 ffffc900400b7f50
>  ffffffff810299a0 0000000000000000 0000000000000000 0000000000000000
> Call Trace:
>  [<ffffffff8104e94e>] smp_store_cpu_info+0x3e/0x40
>  [<ffffffff81029925>] cpu_bringup+0x35/0x90
>  [<ffffffff810299a0>] cpu_bringup_and_idle+0x20/0x40
> Code: 44 89 e7 ff 50 68 0f b7 93 d2 00 00 00 39 d0 75 1c 0f b7 bb da 00 00 00 44 89 e6 e8 24 03 01 00 85 c0 75 07 5b 41 5c 5d c3 0f 0b <0f> 0b 0f b7 8b d4 00 00 00 89 c2 44 89 e6 48 c7 c7 98 87 a6 81
> RIP  [<ffffffff8103e527>] identify_secondary_cpu+0x57/0x80
>  RSP <ffffc900400b7f08>
> ---[ end trace dc5563100443876e ]---
>
> I surmised that reducing the number of dom0 vcpu might solve this issue (they were unbounded)
>
> In testing adding "dom0_max_vcpus=4 dom0_vcpus_pin" to the GRUB_CMDLINE_XEN_DEFAULT line in /etc/defaults/grub and re-running grub2-mkconfig has resulted in the system I have that never booted Xen 4.6.3-12 + Kernel 4.9.13, booting every single time out of 5-10 tests.
>
>
> So...I don't know if there's a race condition somewhere, or what...but...so far this workaround has not failed me.
>
> Thanks,
> -Dave
>
>
>
>> On Fri, Apr 7, 2017 at 6:58 AM, PJ Welsh <pjwelsh at gmail.com
>>> wrote:
>>> I've not gotten any bites from my posting on the xen-devel mailing list.
>>> Here is the only one to-date:
>>> https://lists.xen.org/archives/html/xen-devel/2017-04/msg01069.html
>>>
>>> From that email, there needs to be some hypervisor messages.
>>>
>>> Does anyone know how to produce the hypervisor messages? I've already
>>
>>> removed the rhgb and quiet options from the boot.
>>
>>>
>>> Thanks
>>> PJ
>>
>>
>> I spoke too soon. To get more information: Please see
>>
>> https://wiki.xenproject.org/wiki/Reporting_Bugs_against_Xen_Project
>>
>> and
>>
>> https://wiki.xenproject.org/wiki/Xen_Serial_Console
>>
>> or alternatively at least add "vga=keep".
>>
>> pjwelsh
>
>
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